Answer:
The kidney stone seldom lodges in the kidney. It passes from the kidney into the urinary tract and can become wedged in the ureter before reaching the bladder.
One reason for their formation is insufficient hydration, and drinking extra water may force the kidney stone out. But if barbs on the stone lock it into place, you may need lithotripsy, which breaks up the stone using low-frequency sound waves. The waves are pulsed at an increasing rate and shatter the stone. Eventually it will pass into the bladder (in whole or in pieces). Filter paper is used to capture stones from urine for analysis.
The main treatment for kidney stones is pain relievers and an IV for rehydration. X-rays can locate the stones, and lithotripsy is almost always effective. In cases of large stones or severe blockage, ureteroscopy or even surgical removal may be required.